Fix: Correct engine fixture usage in test_reserved_words

[laughingman7743]

Summary

Fixes the CI failure introduced in #603 where test_reserved_words was calling engine.dialect on a tuple instead of the engine object.

Problem

The engine fixture returns a tuple (engine, conn), but the test was trying to access engine.dialect directly on the tuple, causing:

AttributeError: 'tuple' object has no attribute 'dialect'

Solution

• Unpack the engine fixture tuple like other tests do: engine, conn = engine
• This follows the same pattern used in other tests like test_select_offset_limit

Test Results

• ✅ Local test passes after the fix
• ✅ Follows existing code patterns in the test suite

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